Explore 19.4 The H–R Diagram and Cosmic Distances to understand how the Hertzsprung-Russell (H–R) diagram is utilized in determining cosmic distances by establishing luminosity classes and temperatures of stars.
One of the top rungs in our distance ladder is Supernova Lightcurve Fitting, which allows us to accurately measure the distance to galaxies in the farthest reaches of the universe. If you’d like to play with the simulation from the video, you can find it here.